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authorLinus Torvalds <torvalds@linux-foundation.org>2021-09-15 22:11:48 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-15 22:11:48 +0300
commitd6efd3f18763ac84098fa318742cd2a3bfdf4d72 (patch)
tree3369fa7a752f9793166f93191588b4fb266b20fa /include
parent80be5998ad6339e3e804a772723390cb50b96428 (diff)
parentebdc20d7bc74e8b6a242ff1f30e9017ffca9092c (diff)
downloadlinux-d6efd3f18763ac84098fa318742cd2a3bfdf4d72.tar.xz
Merge branch 'absolute-pointer' (patches from Guenter)
Merge absolute_pointer macro series from Guenter Roeck: "Kernel test builds currently fail for several architectures with error messages such as the following. drivers/net/ethernet/i825xx/82596.c: In function 'i82596_probe': arch/m68k/include/asm/string.h:72:25: error: '__builtin_memcpy' reading 6 bytes from a region of size 0 [-Werror=stringop-overread] Such warnings may be reported by gcc 11.x for string and memory operations on fixed addresses if gcc's builtin functions are used for those operations. This series introduces absolute_pointer() to fix the problem. absolute_pointer() disassociates a pointer from its originating symbol type and context, and thus prevents gcc from making assumptions about pointers passed to memory operations" * emailed patches from Guenter Roeck <linux@roeck-us.net>: alpha: Use absolute_pointer to define COMMAND_LINE alpha: Move setup.h out of uapi net: i825xx: Use absolute_pointer for memcpy from fixed memory location compiler.h: Introduce absolute_pointer macro
Diffstat (limited to 'include')
-rw-r--r--include/linux/compiler.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index b67261a1e3e9..3d5af56337bd 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -188,6 +188,8 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
(typeof(ptr)) (__ptr + (off)); })
#endif
+#define absolute_pointer(val) RELOC_HIDE((void *)(val), 0)
+
#ifndef OPTIMIZER_HIDE_VAR
/* Make the optimizer believe the variable can be manipulated arbitrarily. */
#define OPTIMIZER_HIDE_VAR(var) \